Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSACURA19983.5RL SPECIAL EDITIONREPAIR AND DIAGNOSIS (SINGLE PAGE)HEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSA/C-HEATER SYSTEMSELF-DIAGNOSTICSCODE A: IN-CAR TEMPERATURE SENSOR
1998 Acura 3.5RL Special Edition
Code A: In-Car Temperature Sensor
1998 Acura 3.5RL Special EditionSECTION Code A: In-Car Temperature Sensor
CAUTION:
To avoid damage to sensor, use an ohmmeter with a measuring current of one milliamp or less.
- Remove in-car temperature sensor. See IN-CAR TEMPERATURE SENSOR R & I . Measure resistance across sensor connector terminals. See IN-CAR TEMPERATURE SENSOR RESISTANCE table under TESTING. If resistance is not as specified, replace sensor.
- If resistance is within specifications, remove climate control unit and disconnect 8-pin and 20-pin connectors. Check for continuity between ground and terminal No. 6 (Brown/Black wire) of climate control unit 20-pin connector. See Figure . If continuity exists, repair shorted Brown/Black wire between climate control unit and in-car temperature sensor.
- If continuity does not exist, check for continuity in Brown/Black wire between climate control unit 20-pin connector and in-car temperature sensor. If continuity does not exist, repair open Brown/Black wire between climate control unit and in-car temperature sensor.
- If continuity does exist, check for continuity in Pink/Blue wire between climate control unit 8-pin connector and in-car temperature sensor. If continuity does not exist, repair open Pink/Blue wire between climate control unit and in-car temperature sensor.
- If continuity does exist, check for loose wires or poor connections at climate control unit 8-pin and 20-pin connectors and in-car temperature sensor connector. If connections are okay, substitute known-good climate control unit and recheck. If symptom does not exist after substituting known-good climate control unit, replace original climate control unit.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.